Studies on Crystalline Morphology of Poly(L-lactide)-Poly(ethylene glycol) Diblock Copolymers

Abstract

Abstract: Crystallization behavior and morphology development in biodegradable diblock copolymers of poly(L-lactide)-poly(ethylene glycol)(PLLA-PEG) have been investigated by means of polarized optical microscopy(POM) and atomic force microscopy(AFM). At 110 ℃, PEG5000-PLLA2300 and PEG5000-PLLA6300 diblock copolymers formed banded spherulites, while PEG5000-PLLA12000 did not give banded spherulites. At 120 ℃, PEG5000-PLLA12000 formed banded spherulites, too, indicating that suitable undercooling is one of the key factors to get these banded spherulites. As a solvent and a diluting agent, the presence of PEG blocks brings about decrease in nucleation rate and increase in growth rate of the PLLA crystallization at around 110 ℃, resulting in larger spherulites. The surface of the banded spherulite is shown to consist of concentric ridges and valleys. At the ridges, PLLA lamellae were stacked in edge-on manner, while at the valleys, PLLA lamellae were stacked in flat-on manner.

Key words: Poly(ethylene glycol), Poly(L-lactide), Crystalline morphology, Diblock copolymer

CLC Number:

O631

TrendMD:

SUN Jing-Ru, ZHUANG Xiu-Li, CHEN Xue-Si, JING Xia-Bin . Studies on Crystalline Morphology of Poly(L-lactide)-Poly(ethylene glycol) Diblock Copolymers[J]. Chem. J. Chinese Universities, 2005, 26(5): 956.

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Studies on Crystalline Morphology of Poly(L-lactide)-Poly(ethylene glycol) Diblock Copolymers

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